swift5 動画の再生

Question

AVFoundationとAVKitを使って動画の再生を行いたいです。
以下のコードで実行した際、Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional valueこのようなエラーがlet player = AVPlayer(url: URL(fileURLWithPath:path!))の部分に出てしまいます。
解決方法を教えていただきたいです。

import UIKit
import AVFoundation
import AVKit

class PlayerViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        let path = Bundle.main.path(forResource: "tenteki.mp4", ofType: nil)

        let player = AVPlayer(url: URL(fileURLWithPath:path!))
        let playerController = AVPlayerViewController()

        playerController.player = player
        self.addChild(playerController)
        self.view.addSubview(playerController.view)
        playerController.view.frame = self.view.frame
        player.play()
    }

}

Answer 1

×　let path = Bundle.main.path(forResource: "tenteki.mp4", ofType: nil)
○　let path = Bundle.main.path(forResource: "tenteki", ofType: "mp4")